CN113200558A - 微波煅烧生产微晶α-氧化铝的生产工艺 - Google Patents
微波煅烧生产微晶α-氧化铝的生产工艺 Download PDFInfo
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Abstract
本发明公开了一种微波煅烧生产微晶α‑氧化铝的生产工艺,涉及煅烧氧化铝生产工艺技术领域,具体包括以下步骤:(1)向氧化铝原料中加入复合矿化剂并混合均匀,得到混合料;(2)将混合料放入球磨机中进行球磨,得到研磨料;(3)向研磨料中加入一定比例的吸波剂,并搅拌均匀,然后使用压力机挤压,制得氧化铝生坯;(4)将氧化铝生坯进行干燥处理,以调整氧化铝生坯中的含水量;(5)将干燥好的氧化铝生坯送至微波窑炉内,然后让微波窑炉升温至设定温度,煅烧一定时间,得到α‑氧化铝熟料;(6)将α‑氧化铝熟料进行粉碎,得到微晶α‑氧化铝。本发明产品质量稳定,良品率高于传统窑炉生产方式,能够大幅减少α‑氧化铝制备时的能耗,并实现有害气体零排放。
Description
技术领域
本发明涉及煅烧氧化铝生产工艺技术领域,尤其涉及微波煅烧生产微晶α-氧化铝的生产工艺。
背景技术
α-氧化铝又称煅烧氧化铝,具有熔点高,硬度大等优点,是氧化铝各相中最稳定的相态,广泛应用于耐火材料、玻璃和化工材料等众多领域,α-氧化铝一般都是采用隧道窑、倒焰窑等传统窑炉进行生产,但传统窑炉的煅烧需要大量的燃油、天然气、电能等能源,加热方法为传统的辐射或热导,其热量利用效率仅在10%~30%,能量利用率不高,一些燃料经过燃烧还会产生大量污染性气体,需要进行环保处理,因此传统窑炉用于α-氧化铝的生产具有加热时间久、消耗能源大、污染排放难以控制等缺点,匣钵对粉体的污染及匣钵的损耗也使得生产煅烧氧化铝的成本大大提高。
发明内容
本发明的目的在于:提供微波煅烧生产微晶α-氧化铝的生产工艺,以解决现有技术中氧化铝生产工艺能耗高、污染大、成本高等问题。
本发明采用的技术方案如下:
微波煅烧生产微晶α-氧化铝的生产工艺,包括以下步骤:
(1)向氧化铝原料中加入复合矿化剂并混合均匀,得到混合料;
(2)将步骤(1)中得到的混合料放入球磨机中进行球磨,得到研磨料;
(3)取步骤(2)中得到的研磨料,加入一定比例的吸波剂并搅拌均匀,然后使用压力机挤压,制得氧化铝生坯;
(4)将步骤(3)制得的氧化铝生坯进行干燥处理,以调整氧化铝生坯中的含水量;
(5)将步骤(4)中干燥好的氧化铝生坯送至微波窑炉内,然后让微波窑炉升温至设定温度,煅烧一定时间,得到α-氧化铝熟料;
(6)将步骤(5)得到的α-氧化铝熟料进行粉碎,得到微晶α-氧化铝。
优选的,以氧化铝原料重量计,步骤(1)中的复合矿化剂包括如下成分:氯化物0%-3%、氟化物0%-3%、硼酸0%-1%,所述复合矿化剂的最低添加量为0.01%。
优选的,步骤(2)中,所述球磨机的球料比介于1-6,所述研磨料的D50粒径介于5-30μm,且所述研磨料的200目筛余量≤5%。
优选的,步骤(3)中,所述吸波剂中含有质量比为0.01%-1%的吸波组分,余量为水;所述吸波组分为聚乙烯醇、羧甲基纤维素、木质素中的一种或几种。
优选的,步骤(3)中,所述吸波剂中含有质量比为1%-5%的吸波组分,余量为水;所述吸波组分为拟薄水铝石、γ-氧化铝、ρ-氧化铝、氢氧化铝中的一种或几种。
优选的,其特征在于:步骤(3)中,吸波剂与研磨料的质量比介于0-0.3,所述氧化铝生坯的成型压力介于0.5MPa-60MPa。
优选的,其特征在于:步骤(4)中,干燥处理的温度介于10℃-100℃,干燥处理后的氧化铝生坯含水率介于3%-20%。
优选的,其特征在于:步骤(5)中,设定温度介于1100℃-1500℃,煅烧时间介于0.1-4小时。
优选的,其特征在于:步骤(6)得到的微晶α-氧化铝的粒度介于0.1-1.5微米。
优选的,其特征在于:所述氟化物为氟化铝、氟化钙、氟化镁、氟化铵、氟化氢铵中的任意一种或几种,所述氯化物为氯化铝、氯化钙、氯化镁、氯化铵中的任意一种或几种。
综上所述,由于采用了上述技术方案,本发明的有益效果是:
(1)本发明将氧化铝研磨料制成氧化铝生坯,煅烧时不再需要使用匣钵盛装,只需使用陶瓷衬板,操作简单,且匣钵使用寿命较短,重复使用次数少,而陶瓷衬板可反复使用,降低了生产成本,且制成的砖料不易与衬板发生粘连,煅烧时损失少,产品收率更高,而使用匣钵时,与匣钵内壁接触的氧化铝粉末升温快并发生熔化,煅烧完成后粘连在匣钵内壁,影响产品收率;
(2)微波煅烧不需要通过热传导的方式就可以在短时间内达到很高的温度,其能量利用率非常高,相比于传统窑炉能够显著降低煅烧能耗,且使用电能代替其它燃料作为窑炉能源,不产生尾气,避免了硫氧化物、氮氧化物以及二氧化碳的排放,更加清洁环保;
(3)微波煅烧微晶α-氧化铝是靠分子振动来加热的,而不是靠火焰的灼烧进行加热,因此煅烧时氧化铝生坯的内外整体同时受热,其晶体的生长更加均匀,不会出现外层生长快,中心生长慢的现象,提高了成品率,大幅节约了成本,生产出来的微晶α-氧化铝纯度更高、晶体更加均匀、粒度范围更窄,能生产出品质更好的超细粉体产品;
(4)氧化铝在微波加热过程中,在低温下与微波的耦合性很差,甚至不吸波,无法加热升温,但当达到临界值之后,自身介电损耗快速增加,开始吸收微波能,并将其转化为热量,本发明通过加入一定比例的吸波剂,利用吸波剂中的吸波组分对微波的吸收能力,可使氧化铝在煅烧时快速升温,缩短煅烧时间;
(5)使用匣钵煅烧氧化铝粉时,氧化铝及矿化剂粉末间存在较大空隙,粉料比表面积大,由于矿化剂的挥发或分解温度较低,升温过程中矿化剂及其分解产物很容易从空隙中迅速损失,还未到达最高温度时大部分的矿化剂便已经损失掉,影响矿化剂的使用效果,本发明通过将氧化铝研磨料制成氧化铝生坯,矿化剂与氧化铝之间的空隙被压实,升温过程中砖料内部的矿化剂难以透过砖料表面损失掉,能够确保矿化剂发挥催化作用,提高α-氧化铝的收率;
(6)相对于天然气回转窑、天然气隧道窑等老式窑炉煅烧生产α-氧化铝的工艺,本发明的微波煅烧工艺具有绿色环保、无温室气体排放的显著优势,经过统计,煅烧生产α-氧化铝时,天然气回转窑的天然气消耗量约为100-140m3/t,二氧化碳排放量约196-275Kg/t,天然气隧道窑的天然气消耗量约160-200m3/t,二氧化碳排放量约314-392Kg/t,本发明的微波煅烧工艺至少可减少二氧化碳排放量196Kg/t,对于我国提前到达碳高峰、实现碳中和具有重要意义;
(7)相对于传统电炉使用匣钵煅烧生产α-氧化铝的工艺,本发明的微波煅烧工艺具有能耗低、生产成本低的优势,传统电炉由于采用间接加热,升温速度慢,需要先对电炉进行升温,然后放入氧化铝进行煅烧,煅烧结束后再进行降温,取出煅烧后的氧化铝,造成大量的能源浪费,且生产周期长,经计算,传统电炉生产α-氧化铝,电能消耗最低约1600千瓦时/吨,而微波窑炉电能消耗相对于传统电炉可降低30%-40%,按照1度电均价0.8元/千瓦时计算,可节约生产成本384-512元/吨,除此之外,由于传统电炉需要使用匣钵,而匣钵在生产结束后内壁粘有氧化铝渣,难以再次利用,导致生产时大量消耗匣钵,其成本约600元/吨,本发明将粉末氧化铝制成砖坯,其成本约200-300元/吨,可节约成本300-400元/吨,具有显著的成本优势。
附图说明
图1为本发明实施例11制得微晶α-氧化铝成品电镜照片。
图2为本发明实施例12制得微晶α-氧化铝成品电镜照片。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明,应当理解,此处所描述的具体实施例仅用以解释本发明,并不用于限定本发明。
实施例1
(1)取氧化铝原料100Kg,加入复合矿化剂并混合均匀,得到混合料,所用复合矿化剂包括0.1Kg氯化铝、0.1Kg氟化铝,不含硼酸;
(2)将步骤(1)中得到的混合料放入球磨机中研磨3小时,球料比为6,得到研磨料,测得研磨料的粒度D50为4μm,使用200目筛子过筛,筛余量为0.07%;
(3)取步骤(2)中得到的研磨料,加入30Kg的吸波剂并使用搅拌机搅拌均匀,吸波剂为1%浓度的聚乙烯醇水溶液,然后使用压力机在60MPa条件下挤压成形,制得氧化铝生坯;
(4)将步骤(3)制得的氧化铝生坯在100℃的烘箱中烘干1小时,测量其含水率为26.7%;
(5)将步骤(4)中干燥好的砖料送至微波窑炉内,按100℃/h的升温速率升温至1550℃,煅烧2小时,得到α-氧化铝熟料;
(6)使用破碎机将步骤(5)得到的α-氧化铝熟料破碎呈小块,然后使用球磨机粉碎研磨,直至粒度为1.5微米,得到微晶α-氧化铝成品。
实施例2
(1)取氧化铝原料100Kg,加入复合矿化剂并混合均匀,得到混合料,所用复合矿化剂包括0.01Kg氯化钙、0.01Kg硼酸,不含氟化物;
(2)将步骤(1)中得到的混合料放入球磨机中研磨3小时,球料比为5,得到研磨料,测得研磨料的粒度D50为7μm,使用200目筛子过筛,筛余量为0.34%;
(3)取步骤(2)中得到的研磨料,加入25Kg的吸波剂并使用搅拌机搅拌均匀,吸波剂为1%浓度的羧甲基纤维素水溶液,然后使用压力机在50MPa条件下挤压成形,制得氧化铝生坯;
(4)将步骤(3)制得的氧化铝生坯在80℃的烘箱中烘干2小时,测量其含水率为22.3%;
(5)将步骤(4)中干燥好的砖料送至微波窑炉内,按100℃/h的升温速率升温至1500℃,煅烧1小时,得到α-氧化铝熟料;
(6)使用破碎机将步骤(5)得到的α-氧化铝熟料破碎呈小块,然后使用球磨机粉碎研磨,直至粒度为0.1微米,得到微晶α-氧化铝成品。
实施例3
(1)取氧化铝原料100Kg,加入复合矿化剂并混合均匀,得到混合料,所用复合矿化剂包括0.01Kg氯化镁、0.01Kg氟化钙、0.01Kg硼酸;
(2)将步骤(1)中得到的混合料放入球磨机中研磨3小时,球料比为4,得到研磨料,测得研磨料的粒度D50为11μm,使用200目筛子过筛,筛余量为0.77%;
(3)取步骤(2)中得到的研磨料,加入20Kg的吸波剂并使用搅拌机搅拌均匀,吸波剂为1%浓度的木质素水溶液,然后使用压力机在40MPa条件下挤压成形,制得氧化铝生坯;
(4)将步骤(3)制得的氧化铝生坯在50℃的烘箱中烘干2小时,测量其含水率为17.7%;
(5)将步骤(4)中干燥好的砖料送至微波窑炉内,按100℃/h的升温速率升温至1400℃,煅烧0.1小时,得到α-氧化铝熟料;
(6)使用破碎机将步骤(5)得到的α-氧化铝熟料破碎呈小块,然后使用球磨机粉碎研磨,直至粒度为0.5微米,得到微晶α-氧化铝成品。
实施例4
(1)取氧化铝原料100Kg,加入复合矿化剂并混合均匀,得到混合料,所用复合矿化剂包括0.1Kg氯化铵、0.1Kg氯化镁,不含氟化物及硼酸;
(2)将步骤(1)中得到的混合料放入球磨机中研磨3小时,球料比为3,得到研磨料,测得研磨料的粒度D50为17μm,使用200目筛子过筛,筛余量为1.46%;
(3)取步骤(2)中得到的研磨料,加入15Kg的吸波剂并使用搅拌机搅拌均匀,吸波剂为0.5%浓度的聚乙烯醇水溶液,然后使用压力机在20MPa条件下挤压成形,制得氧化铝生坯;
(4)将步骤(3)制得的氧化铝生坯在25℃的烘箱中烘干2小时,测量其含水率为13.5%;
(5)将步骤(4)中干燥好的砖料送至微波窑炉内,按100℃/h的升温速率升温至1300℃,煅烧1.5小时,得到α-氧化铝熟料;
(6)使用破碎机将步骤(5)得到的α-氧化铝熟料破碎呈小块,然后使用球磨机粉碎研磨,直至粒度为1.0微米,得到微晶α-氧化铝成品。
实施例5
(1)取氧化铝原料100Kg,加入复合矿化剂并混合均匀,得到混合料,所用复合矿化剂包括0.03Kg氟化镁、0.03Kg氟化钙、0.02Kg氟化铵、0.02Kg氟化氢铵,不含氯化物及硼酸;
(2)将步骤(1)中得到的混合料放入球磨机中研磨3小时,球料比为2,得到研磨料,测得研磨料的粒度D50为25μm,使用200目筛子过筛,筛余量为2.92%;
(3)取步骤(2)中得到的研磨料,加入10Kg的吸波剂并使用搅拌机搅拌均匀,吸波剂为0.01%浓度的聚乙烯醇水溶液,然后使用压力机在5MPa条件下挤压成形,制得氧化铝生坯;
(4)将步骤(3)制得的氧化铝生坯在10℃的烘箱中晾干2小时,测量其含水率为8.5%;
(5)将步骤(4)中干燥好的砖料送至微波窑炉内,按100℃/h的升温速率升温至1200℃,煅烧0.5小时,得到α-氧化铝熟料;
(6)使用破碎机将步骤(5)得到的α-氧化铝熟料破碎呈小块,然后使用球磨机粉碎研磨,直至粒度为1.0微米,得到微晶α-氧化铝成品。
实施例6
(1)取氧化铝原料100Kg,加入复合矿化剂并混合均匀,得到混合料,所用复合矿化剂包括0.5Kg氯化铵、0.5Kg氟化氢铵、0.5Kg硼酸;
(2)将步骤(1)中得到的混合料放入球磨机中研磨3小时,球料比为1,得到研磨料,测得研磨料的粒度D50为33μm,使用200目筛子过筛,筛余量为5.11%;
(3)取步骤(2)中得到的研磨料,加入3Kg的吸波剂并使用搅拌机搅拌均匀,吸波剂为0.5%浓度的聚乙烯醇水溶液、0.5%浓度的聚乙烯醇水溶液与0.5%浓度的木质素水溶液按1:1:1的质量比混合而成,然后使用压力机在1MPa条件下挤压成形,制得氧化铝生坯;
(4)将步骤(3)制得的氧化铝生坯在40℃的烘箱中烘干2小时,测量其含水率为2.6%;
(5)将步骤(4)中干燥好的砖料送至微波窑炉内,按100℃/h的升温速率升温至1100℃,煅烧2.5小时,得到α-氧化铝熟料;
(6)使用破碎机将步骤(5)得到的α-氧化铝熟料破碎呈小块,然后使用球磨机粉碎研磨,直至粒度为1.0微米,得到微晶α-氧化铝成品。
实施例7
(1)取氧化铝原料100Kg,加入复合矿化剂并混合均匀,得到混合料,所用复合矿化剂包括1Kg氯化钙、1Kg氟化铝,1Kg硼酸;
(2)将步骤(1)中得到的混合料放入球磨机中研磨3小时,球料比为1.5,得到研磨料,测得研磨料的粒度D50为16μm,使用200目筛子过筛,筛余量为1.39%;
(3)取步骤(2)中得到的研磨料,加入15Kg的吸波剂并使用搅拌机搅拌均匀,吸波剂为拟薄水铝石与水按质量比1:100混合而成,然后使用压力机在0.5MPa条件下挤压成形,制得氧化铝生坯;
(4)将步骤(3)制得的氧化铝生坯在40℃的烘箱中烘干2小时,测量其含水率为12.1%;
(5)将步骤(4)中干燥好的砖料送至微波窑炉内,按100℃/h的升温速率升温至1050℃,煅烧3小时,得到α-氧化铝熟料;
(6)使用破碎机将步骤(5)得到的α-氧化铝熟料破碎呈小块,然后使用球磨机粉碎研磨,直至粒度为1.0微米,得到微晶α-氧化铝成品。
实施例8
(1)取氧化铝原料100Kg,加入复合矿化剂并混合均匀,得到混合料,所用复合矿化剂包括2Kg氯化铝、2Kg氟化铝,1Kg硼酸;
(2)将步骤(1)中得到的混合料放入球磨机中研磨3小时,球料比为1.5,得到研磨料,测得研磨料的粒度D50为21μm,使用200目筛子过筛,筛余量为1.93%;
(3)取步骤(2)中得到的研磨料,加入25Kg的吸波剂并使用搅拌机搅拌均匀,吸波剂为γ-氧化铝与水按质量比1:50混合而成,然后使用压力机在4MPa条件下挤压成形,制得氧化铝生坯;
(4)将步骤(3)制得的氧化铝生坯在30℃的烘箱中烘干2小时,测量其含水率为17.1%;
(5)将步骤(4)中干燥好的砖料送至微波窑炉内,按100℃/h的升温速率升温至1250℃,煅烧3.5小时,得到α-氧化铝熟料;
(6)使用破碎机将步骤(5)得到的α-氧化铝熟料破碎呈小块,然后使用球磨机粉碎研磨,直至粒度为1.0微米,得到微晶α-氧化铝成品。
实施例9
(1)取氧化铝原料100Kg,加入复合矿化剂并混合均匀,得到混合料,所用复合矿化剂为3Kg氯化铝、3Kg氟化铝,1Kg硼酸;
(2)将步骤(1)中得到的混合料放入球磨机中研磨3小时,球料比为1.5,得到研磨料,测得研磨料的粒度D50为25μm,使用200目筛子过筛,筛余量为2.83%;
(3)取步骤(2)中得到的研磨料,加入15Kg的吸波剂并使用搅拌机搅拌均匀,吸波剂为ρ-氧化铝与水按质量比1:50混合而成,然后使用压力机在2MPa条件下挤压成形,制得氧化铝生坯;
(4)将步骤(3)制得的氧化铝生坯在30℃的烘箱中烘干2小时,测量其含水率为10.8%;
(5)将步骤(4)中干燥好的砖料送至微波窑炉内,按100℃/h的升温速率升温至1250℃,煅烧4小时,得到α-氧化铝熟料;
(6)使用破碎机将步骤(5)得到的α-氧化铝熟料破碎呈小块,然后使用球磨机粉碎研磨,直至粒度为1.0微米,得到微晶α-氧化铝成品。
实施例10
(1)取氧化铝原料100Kg,加入复合矿化剂并混合均匀,得到混合料,所用复合矿化剂为0.2Kg氟化铝,不含氯化物、硼酸;
(2)将步骤(1)中得到的混合料放入球磨机中研磨3小时,球料比为1.5,得到研磨料,测得研磨料的粒度D50为27μm,使用200目筛子过筛,筛余量为3.79%;
(3)取步骤(2)中得到的研磨料,加入10Kg的吸波剂并使用搅拌机搅拌均匀,吸波剂为氢氧化铝与水按质量比1:20混合而成,然后使用压力机在2MPa条件下挤压成形,制得氧化铝生坯;
(4)将步骤(3)制得的氧化铝生坯在20℃的烘箱中烘干2小时,测量其含水率为7.6%;
(5)将步骤(4)中干燥好的砖料送至微波窑炉内,按100℃/h的升温速率升温至1250℃,煅烧1小时,得到α-氧化铝熟料;
(6)使用破碎机将步骤(5)得到的α-氧化铝熟料破碎呈小块,然后使用球磨机粉碎研磨,直至粒度为1.0微米,得到微晶α-氧化铝成品。
实施例11
(1)取氧化铝原料10000Kg,加入复合矿化剂并混合均匀,得到混合料,所用复合矿化剂包括1Kg氯化铝、1Kg氟化铝,1Kg硼酸;
(2)将步骤(1)中得到的混合料放入球磨机中研磨3小时,球料比为1.5,得到研磨料,测得研磨料的粒度D50为15μm,使用200目筛子过筛,筛余量为0.07%;
(3)取步骤(2)中得到的研磨料,加入2500Kg的吸波剂并使用搅拌机搅拌均匀,吸波剂为氢氧化铝与水按质量比1:20混合而成,然后使用压力机在10MPa条件下挤压成形,制得氧化铝生坯;
(4)将步骤(3)制得的氧化铝生坯在80℃的烘箱中烘干6小时,测量其含水率为11%;
(5)将步骤(4)中干燥好的生坯送至微波窑炉内,按100℃/h的升温速率升温至1250℃,煅烧1小时,得到α-氧化铝熟料;
(6)使用破碎机将步骤(5)得到的α-氧化铝熟料破碎呈小块,然后使用球磨机粉碎研磨,直至粒度为0.8微米,得到微晶α-氧化铝成品。
煅烧前后记录微波窑炉独立电表数值,得煅烧前后电表差值为9771千瓦时,单位电耗9771千瓦时/吨,老式电炉电耗按1600千瓦时/吨计,则节约电能39%。
取适量步骤(6)中得到的微晶α-氧化铝成品,使用SEM扫描电镜进行微观检测,见附图1。
实施例12
(1)取氧化铝原料10000Kg,加入复合矿化剂并混合均匀,得到混合料,所用复合矿化剂包括1Kg氯化铝、1Kg氟化铝,1Kg硼酸;
(2)将步骤(1)中得到的混合料放入球磨机中研磨3小时,球料比为1.5,得到研磨料,测得研磨料的粒度D50为15μm,使用200目筛子过筛,筛余量为0.07%;
(3)取步骤(2)中得到的研磨料,加入1500Kg的吸波剂并使用搅拌机搅拌均匀,吸波剂为1%浓度的聚乙烯醇水溶液,然后使用压力机在10MPa条件下挤压成形,制得氧化铝生坯;
(4)将步骤(3)制得的氧化铝生坯在80℃的烘箱中烘干3小时,测量其含水率为10.1%;
(5)将步骤(4)中干燥好的生坯送至微波窑炉内,按100℃/h的升温速率升温至1300℃,煅烧1小时,得到α-氧化铝熟料;
(6)使用破碎机将步骤(5)得到的α-氧化铝熟料破碎呈小块,然后使用球磨机粉碎研磨,直至粒度为1.2微米,得到微晶α-氧化铝成品。
煅烧前后记录微波窑炉独立电表数值,得煅烧前后电表差值为10827千瓦时,单位电耗1082.7千瓦时/吨,老式电炉电耗按1600千瓦时/吨计,则节约电能33%。
取适量步骤(6)中得到的微晶α-氧化铝成品,使用SEM扫描电镜进行微观检测,见附图2。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。
Claims (10)
1.微波煅烧生产微晶α-氧化铝的生产工艺,其特征在于,包括以下步骤:
(1)向氧化铝原料中加入复合矿化剂并混合均匀,得到混合料;
(2)将步骤(1)中得到的混合料放入球磨机中进行球磨,得到研磨料;
(3)取步骤(2)中得到的研磨料,加入一定比例的吸波剂并搅拌均匀,然后使用压力机挤压,制得氧化铝生坯;
(4)将步骤(3)制得的氧化铝生坯进行干燥处理,以调整氧化铝生坯中的含水量;
(5)将步骤(4)中干燥好的氧化铝生坯送至微波窑炉内,然后让微波窑炉升温至设定温度,煅烧一定时间,得到α-氧化铝熟料;
(6)将步骤(5)得到的α-氧化铝熟料进行粉碎,得到微晶α-氧化铝。
2.根据权利要求1所述的微波煅烧生产微晶α-氧化铝的生产工艺,其特征在于:以氧化铝原料重量计,步骤(1)中的复合矿化剂包括如下成分:氯化物0%-3%、氟化物0%-3%、硼酸0%-1%,所述复合矿化剂的最低添加量为0.01%。
3.根据权利要求1或2所述的微波煅烧生产微晶α-氧化铝的生产工艺,其特征在于:步骤(2)中,所述球磨机的球料比介于1-6,所述研磨料的D50粒径介于5-30μm,且所述研磨料的200目筛余量≤5%。
4.根据权利要求2所述的微波煅烧生产微晶α-氧化铝的生产工艺,其特征在于:步骤(3)中,所述吸波剂中含有质量比为0.01%-1%的吸波组分,余量为水;所述吸波组分为聚乙烯醇、羧甲基纤维素、木质素中的一种或几种。
5.根据权利要求2所述的微波煅烧生产微晶α-氧化铝的生产工艺,其特征在于:步骤(3)中,所述吸波剂中含有质量比为1%-5%的吸波组分,余量为水;所述吸波组分为拟薄水铝石、γ-氧化铝、ρ-氧化铝、氢氧化铝中的一种或几种。
6.根据权利要求1或4或5所述的微波煅烧生产微晶α-氧化铝的生产工艺,其特征在于:步骤(3)中,吸波剂与研磨料的质量比介于0-0.3,所述氧化铝生坯的成型压力介于0.5MPa-60MPa。
7.根据权利要求1或4或5所述的微波煅烧生产微晶α-氧化铝的生产工艺,其特征在于:步骤(4)中,干燥处理的温度介于10℃-100℃,干燥处理后的氧化铝生坯含水率介于3%-20%。
8.根据权利要求1或4或5所述的微波煅烧生产微晶α-氧化铝的生产工艺,其特征在于:步骤(5)中,设定温度介于1100℃-1500℃,煅烧时间介于0.1-4小时。
9.根据权利要求1或4或5所述的微波煅烧生产微晶α-氧化铝的生产工艺,其特征在于:步骤(6)得到的微晶α-氧化铝的粒度介于0.1-1.5微米。
10.根据权利要求2或4或5所述的微波煅烧生产微晶α-氧化铝的生产工艺,其特征在于:所述氟化物为氟化铝、氟化钙、氟化镁、氟化铵、氟化氢铵中的任意一种或几种,所述氯化物为氯化铝、氯化钙、氯化镁、氯化铵中的任意一种或几种。
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